Provide a structure for the following compound: molecular mass 71; ir: 3200 (strong, broad), 2250 cm^–1; no absorptions in the 1500–2250 cm–1 range; 1h nmr: δ 2.62 (2h, t, j = 6 hz), δ 3.42 (1h, broad s; eliminated by d2o shake), δ 3.85 (2h, t, j = 6 hz).

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.

Which reason best explains why metals are malleable? a)because they have delocalized electrons b)because they have localized electrons c)because they have ionic bonds d)because they have rigid bonds

Which of the following is true about the speed of light? it depends on the wavelength.